Unfortunately the database cannot be moved due to system settings within the software. The database itself must be stored in one of two different locations, depending on which option you selected during the installation.
If you selected the Just me option during installation, the database will be here:
C:\Users\(Your username)\AppData\Roaming\Acorah Software Products\TaxCalcHub
If you selected the All users option for during installation, the database will be here:
NOTE - The actual tax returns for Personal users are still stored in individual files. if there is a problem with the database it can be recreated without losing data from the returns.